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- W2078151972 abstract "The energetics of microporous titanosilicates ETS-4 (K1.13Na3.92Ti3.07Si8.17O25·8.64H2O) and ETS-10 (K0.61Na1.09Ti1.10Si4.98O13·2.89H2O) has been investigated by high-temperature drop solution calorimetry using lead borate as the solvent at 974 K. Combining the measured heats of drop solution with the published enthalpies of drop solution and formation for the constituent oxides, the standard enthalpies of formation from the oxides (ΔH0f,ox) and from the elements (ΔHf,el0) for both phases were derived for the first time. The obtained values (in kJ/mol) are as follows: ΔHf,ox0(ETS-4)=−818.5±13.1, ΔHf,el0(ETS-4)=−14,642.8±15.9, ΔHf,ox0(ETS-10)=−262.2±3.1, and ΔHf,el0(ETS-10)=−6995.2±6.1. Comparison between the ΔHf,ox0 (or ΔHf,el0) values of the two phases suggests that ETS-4 is thermodynamically more stable than ETS-10 with respect to the oxides (or the elements) at 298 K and 1 atm. This behavior can largely be attributed to the higher degree of hydration of ETS-4 than that of ETS-10." @default.
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- W2078151972 date "2001-10-01" @default.
- W2078151972 modified "2023-10-17" @default.
- W2078151972 title "Enthalpies of formation of microporous titanosilicates ETS-4 and ETS-10" @default.
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- W2078151972 doi "https://doi.org/10.1016/s1387-1811(01)00388-2" @default.
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